The Krubera Cave is the deepest in the world, descending 2,197 meters from its inconspicuous entrance to its deepest explored areas. It’s located in Abkhazia, a breakaway territory in the Republic of Georgia. In some ways, caving is an even more extreme activity than high altitude climbing. Descending to the bottom of Krubera takes a team of dozens of people over a month, a month during which they’ll never see the sun.